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起動繼電器：保護線路，點火開關。
汽車啟(qi)動繼(ji)電器的作用：
1、主要是(shi)(shi)通(tong)過控(kong)制低壓(ya)(ya)線路(lu)(lu)的(de)電流來(lai)控(kong)制高壓(ya)(ya)線路(lu)(lu)的(de)電流，起(qi)到電流開關的(de)作用(yong)。啟(qi)動繼電器(qi)是(shi)(shi)啟(qi)動系統組成部件之(zhi)一，在(zai)汽車上(shang)主要作用(yong)為小(xiao)電流；
2、控制(zhi)大電(dian)(dian)流方式啟動(dong)(dong)(dong)(dong)馬達轉(zhuan)動(dong)(dong)(dong)(dong)，從而(er)帶動(dong)(dong)(dong)(dong)發電(dian)(dian)機內部磁電(dian)(dian)機轉(zhuan)子轉(zhuan)動(dong)(dong)(dong)(dong)，給點(dian)火(huo)(huo)器輸入點(dian)火(huo)(huo)脈沖信號，使點(dian)火(huo)(huo)器產生電(dian)(dian)火(huo)(huo)花，點(dian)燃(ran)汽缸(gang)內的混合燃(ran)氣并做功。繼(ji)電(dian)(dian)器屬(shu)于開關(guan)類，它是利用電(dian)(dian)磁原理、機電(dian)(dian)原理使接點(dian)閉合或斷開來驅(qu)動(dong)(dong)(dong)(dong)或控制(zhi)相(xiang)關(guan)電(dian)(dian)路的；
3、繼電(dian)器(qi)為一種(zhong)控(kong)制(zhi)器(qi)件，它有受控(kong)系(xi)統（輸(shu)入回路）和控(kong)制(zhi)系(xi)統（輸(shu)出(chu)回路）兩部分(fen)。當輸(shu)入量（電(dian)、磁(ci)、光、熱等物理量）達(da)到某一定值時，輸(shu)出(chu)量躍變式(shi)地由零變化到一定值（或由一定值跳變到零），從(cong)而實(shi)現對電(dian)路的控(kong)制(zhi)、保護、調節和傳遞信息等目的。
啟(qi)動(dong)繼電(dian)(dian)(dian)器是(shi)(shi)單獨部件，其作用是(shi)(shi)接通、斷開吸引線(xian)圈(quan)和(he)保持線(xian)圈(quan)電(dian)(dian)(dian)路。在電(dian)(dian)(dian)冰箱、空(kong)調器這類小型(xing)制冷(leng)設備中(zhong)，制冷(leng)壓縮機多采用單相分相式異步電(dian)(dian)(dian)動(dong)機，啟(qi)動(dong)繼電(dian)(dian)(dian)器的作用是(shi)(shi)幫助電(dian)(dian)(dian)動(dong)機啟(qi)動(dong)，啟(qi)動(dong)完成后自動(dong)斷開副(fu)繞組(zu)，避免(mian)燒壞副(fu)繞組(zu)線(xian)圈(quan)。
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